Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc3e60c0e7ac14…

MALICIOUS

PDF

92.3 KB Created: 2021-08-21 00:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 688cc49f2a40cdc914c2f5288e349b6f SHA-1: ef4f0a9c96db5fbb0ac1b51ddceaa732a1717d5b SHA-256: 1fdc3e60c0e7ac145dee3750f9effd76ee92117d5b01844b17e25b535f870f87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=khao+yai+private+tour+guide PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/99ed99472068081e4078989b2557da87/popejabesuwuz.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/joluwupukimofato.pdfIn PDF document text
    • http://mp-journal.com/media/file/juzefizisekipijizim.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/13285117650.pdfIn PDF document text
    • http://newo.ru/files/files/folidejurodofem.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/38474498794.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vonolabofigigebutamegegaz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8d8d12b509668fd59e2ab9dfbac03b62/71228580309.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/foxifopadatimaf.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/25422227144.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8e18b8750a74f7f4b80ed99816ddfee7/bagaj.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/40777177874.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/fodizekak.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/57455351237.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/baxolakerejovegatan.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sqbi3pkkeoa3qcju347a9r85cs/44703113356.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/79509692742.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nefapimukarip.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/11328784602.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/94860074119.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b72fb0f8b745df7d32d394c66856f2d/nimulagijozonex.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/fesowunidovirafuvaxoruvub.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7865f449a4---20443713051.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/77e278b7b75e8ee4ff29d64539379cb1/bosapexufiroxasologo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 18580 bytes
SHA-256: 6d8b7cf51040012877eb1798896db62c7e52ff9a4f8f4e8ba7fadb38a981210a
font_01_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 10624 bytes
SHA-256: c8026da100b89152f19110f40e8d3b7d6956bb462d432b49d75b6df95c0c2988

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